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Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars

Diaplectic feldspathic glass, commonly known as maskelynite, is a widely used impact indicator, notably for shergottites, whose shock conditions are keys to their geochemistry and launch mechanism. However, classic reverberating shock recovery experiments show maskelynitization at higher shock press...

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Autores principales: Hu, Jinping, Asimow, Paul D., Liu, Yang, Ma, Chi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10156110/
https://www.ncbi.nlm.nih.gov/pubmed/37134156
http://dx.doi.org/10.1126/sciadv.adf2906
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author Hu, Jinping
Asimow, Paul D.
Liu, Yang
Ma, Chi
author_facet Hu, Jinping
Asimow, Paul D.
Liu, Yang
Ma, Chi
author_sort Hu, Jinping
collection PubMed
description Diaplectic feldspathic glass, commonly known as maskelynite, is a widely used impact indicator, notably for shergottites, whose shock conditions are keys to their geochemistry and launch mechanism. However, classic reverberating shock recovery experiments show maskelynitization at higher shock pressures (>30 gigapascals) than the stability field of the high-pressure minerals found in many shergottites (15 to 25 gigapascals). Most likely, differences between experimental loading paths and those appropriate for martian impacts have created this ambiguity in shergottite shock histories. Shock reverberation yields lower temperature and deviatoric stress than single-shock planetary impacts at equivalent pressure. We report the Hugoniot equation of state of a martian analog basalt and single-shock recovery experiments, indicating partial-to-complete maskelynitization at 17 to 22 gigapascals, consistent with the high-pressure minerals in maskelynitized shergottites. This pressure explains the presence of intact magmatic accessory minerals, used for geochronology in shergottites, and offers a new pressure-time profile for modeling shergottite launch, likely requiring greater origin depth.
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spelling pubmed-101561102023-05-04 Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars Hu, Jinping Asimow, Paul D. Liu, Yang Ma, Chi Sci Adv Earth, Environmental, Ecological, and Space Sciences Diaplectic feldspathic glass, commonly known as maskelynite, is a widely used impact indicator, notably for shergottites, whose shock conditions are keys to their geochemistry and launch mechanism. However, classic reverberating shock recovery experiments show maskelynitization at higher shock pressures (>30 gigapascals) than the stability field of the high-pressure minerals found in many shergottites (15 to 25 gigapascals). Most likely, differences between experimental loading paths and those appropriate for martian impacts have created this ambiguity in shergottite shock histories. Shock reverberation yields lower temperature and deviatoric stress than single-shock planetary impacts at equivalent pressure. We report the Hugoniot equation of state of a martian analog basalt and single-shock recovery experiments, indicating partial-to-complete maskelynitization at 17 to 22 gigapascals, consistent with the high-pressure minerals in maskelynitized shergottites. This pressure explains the presence of intact magmatic accessory minerals, used for geochronology in shergottites, and offers a new pressure-time profile for modeling shergottite launch, likely requiring greater origin depth. American Association for the Advancement of Science 2023-05-03 /pmc/articles/PMC10156110/ /pubmed/37134156 http://dx.doi.org/10.1126/sciadv.adf2906 Text en Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY). https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Earth, Environmental, Ecological, and Space Sciences
Hu, Jinping
Asimow, Paul D.
Liu, Yang
Ma, Chi
Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars
title Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars
title_full Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars
title_fullStr Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars
title_full_unstemmed Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars
title_short Shock-recovered maskelynite indicates low-pressure ejection of shergottites from Mars
title_sort shock-recovered maskelynite indicates low-pressure ejection of shergottites from mars
topic Earth, Environmental, Ecological, and Space Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10156110/
https://www.ncbi.nlm.nih.gov/pubmed/37134156
http://dx.doi.org/10.1126/sciadv.adf2906
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